INSTALLATION AND OPERATING MANUAL PT2600 6 Chan PRT

Installation and Operating Manual
ASL, Pharmagraph Division, PT2600 PRT Input Module
Issue 1.11
PT2600-IOM.doc
18 May 2011
Page 1 of 16
INSTALLATION AND OPERATING MANUAL
PT2600 6 Chan PRT Input Module
ASL, Pharmagraph Division
Pharmagraph (a division of Acquisition Systems Ltd), 3 Lakeside Business Park, Sandhurst, Berkshire, UK
Tel.: +44 (0) 1252 861700 Fax: +44 (0) 1252 861155 e-mail: [email protected]
Installation and Operating Manual
ASL, Pharmagraph Division, PT2600 PRT Input Module
Issue 1.11
PT2600-IOM.doc
18 May 2011
Page 2 of 16
TABLE OF CONTENTS
1
2
3
4
5
6
7
8
9
INTRODUCTION........................................................................................................3
SPECIFICATION........................................................................................................4
AN OVERVIEW OF THE PT2600...............................................................................5
3.1 Power Supply ....................................................................................................5
3.2 Communications Interfaces ...............................................................................5
3.3 PRT Inputs ........................................................................................................5
PT2600 OPERATION.................................................................................................6
4.1 Address Selection .............................................................................................6
4.2 Mode Selection..................................................................................................6
CONNECTING THE PT2600......................................................................................7
5.1 DC Power Connection .......................................................................................7
5.2 Host RS485 Connection ....................................................................................7
5.3 Aux RS485 Connection .....................................................................................8
5.3.1 Aux Interface as part of a fault-tolerant system ......................................8
5.3.2 Aux Interface as a host RS485 re-transmitter.........................................8
5.4 4 Wire PRT Connection.....................................................................................9
5.5 3 Wire PRT Connection.....................................................................................9
5.6 2 Wire PRT Connection.....................................................................................10
RESISTANCE MEASUREMENT................................................................................10
MODE SELECTION ...................................................................................................11
7.1 Re-transmit Mode Selection ..............................................................................11
7.2 Self-Test Mode Selection ..................................................................................11
ORIENTATION OF HEADER CONNECTORS ...........................................................12
USING SERIES 2000 INTERCONNECT MODULES .................................................13
REVISION HISTORY
Date
Revision
Updated by
Detail
05 Nov 2009
21 Jan 2010
1.00
1.01
J. McCollin
K.J.McWilliam
Created
Updated following review
Document location: M:\Hardware\PT2600 PRT Module\PT2600-IOM.doc
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Issue 1.11
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18 May 2011
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Installation and Operating Manual
ASL, Pharmagraph Division, PT2600 PRT Input Module
1
INTRODUCTION
This document constitutes the Installation and Operating Manual for the PT2600 PRT Input
Module. It should be read in conjunction with the enVigil software manual that describes the
configuration and operation of the monitoring software.
The PT2600 6 Chan PRT Input Module provides:
o
6 PT100 3 or 4 wire input channels.
Each input has dual 1mA current sources for the energisation of sensors and contains all the
circuitry for measuring the resistance. The currents are switched on only whilst the channel is
being measured.
Calibration constants are held in flash memory within the unit.
The modules are connected to a computer using an RS485 link. Two ports are supplied, a
host and an auxiliary port. The host port is generally used for connection to a host computer.
The second (Aux) RS485 bus may be used for:
o
Calibration of the module.
o
Connection to a slave PC if used as part of a dual-redundant system.
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Installation and Operating Manual
ASL, Pharmagraph Division, PT2600 PRT Input Module
2
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SPECIFICATION
•
6 Analog inputs for PT100 sensors
Linearisation to IEC751 or JIS C1604
Output available in °C or °F
•
DIN rail mounted enclosure
Width 23mm
Height 85mm
Depth 105mm
Weight 85g
•
Power supply
24VDC ±10%
100mA (typ.), 200mA (max.)
•
Interfaces
RS485 host, 19k2 baud, 1.2km
RS485 aux, 19k2 baud, 1.2km
•
Environmental
Operating temperature 0 to 50°C
Storage temperature -20 to 60°C
•
Measurement
Accuracy ±0.15°C
Temperature coefficient 0.005°C /°C
Series mode rejection 65dB
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Installation and Operating Manual
ASL, Pharmagraph Division, PT2600 PRT Input Module
3
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AN OVERVIEW OF THE PT2600
The general arrangement of a system using PT2600 modules shown below:
24VDC
RS485
Host PC
A.In 0
A.In 3
A.In 1
A.In 4
A.In 2
A.In 5
3.1 Power Supply
A suitable 24Vdc supply should be provided to the PT2600 enclosure.
3.2 Communications Interfaces
An RS485 bus from the enVigil Server PC should be connected to the PT2600 host port. If
required, a second PC can be connected to the Aux port. (See section 5 for further details).
3.3 PRT Inputs
Each module has 6 PRT inputs which are designed to energise and monitor 3 or 4 wire
PT100 sensors. The module provides a 1mA current for energising the sensor and a second
1mA source for compensating for lead resistance in 3 wire mode. 3 or 4 wire operation is
selected by fitting jumpers inside the unit.
The voltage developed across the sensor is measured and the resistance calculated. Switch
settings determine if this resistance is to be converted to °C or °F using either the IEC751
tables (commonly known as = 0.00385) or the JIS C1604 tables ( = 0.003916).
Pharmagraph (a division of Acquisition Systems Ltd), 3 Lakeside Business Park, Sandhurst, Berkshire, UK
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Installation and Operating Manual
ASL, Pharmagraph Division, PT2600 PRT Input Module
4
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PT2600 OPERATION
4.1 Address Selection
Two binary-coded-decimal address switches define the host RS485 address, and must be
set in the range 0 to 31 to correspond with each device used in the configuration software.
SW1 are the ‘Units’ and SW2 are the ‘Tens’.
NOTE: The address switches are also used to configure some special mode selections such
as ‘Self-test’ and ‘Re-transmit’ modes (see section 7).
4.2 Mode Selection
Switch 3 selects the temperature units and the linearization to be performed. It is set
according to the following table
Switch SW3
Off
On
1
°C
°F
2
IEC751 ( = 0.00385)
JIS C1604 ( = 0.003916)
Note that SW3 positions are ’ON’ when the slider is away from the position number,
towards the ‘ON’ legend.
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Installation and Operating Manual
ASL, Pharmagraph Division, PT2600 PRT Input Module
5
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CONNECTING THE PT2600
5.1 DC Power Connection
Connect the DC supply to JP1via a 2 pin header plug.
JP1 Pin No.
Description
1 (nearest to module corner)
+24Vdc
2
0V
Immediately after power is applied to the module the diagnostic LEDs D3 (red) and D4
(green) flash to indicate the firmware version. For example, two red flashes followed by one
green flash indicates firmware version 2.1.
5.2
Host RS485 Connection
Connect the RS485 bus from the host PC to the host port via a three pin header plug.
JP2 Pin no.
Signal Description
1
RS485A
2
RS485B
3
Screen
When using RS485 over long distances, the bus may need to be terminated and biased.
Biasing can be done by switching SW3/3 and SW3/4 to ‘ON’ on one of the PCB’s (usually the
last module in the line.) Termination can be done by fitting a suitable terminator to the last
module in the line.
The Host RS485 port has two diagnostic LEDs to assist in on-site fault finding. The red LED
(D3) pulses for 10ms for each received character and the green LED (D4) pulses for each
transmitted character.
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Installation and Operating Manual
ASL, Pharmagraph Division, PT2600 PRT Input Module
5.3
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Aux RS485 Connection
If part of a dual-redundant (master/slave) system then connect the Aux RS485 bus of this
module to the slave computer using a three pin plug.
JP3 Pin no.
Signal Description
1
RS485A
2
RS485B
3
Screen
The Aux RS485 port has two diagnostic LEDs to assist in on-site fault finding. The red LED
(D5) pulses for 10ms for each received character and the green LED (D6) pulses for each
transmitted character.
5.3.1 Aux Interface as part of a fault-tolerant system
The auxiliary RS485 bus from the second PC (or Serial Device Server if used) should be
looped into and out of each module in turn, until the last module is reached. Only the final
module in the chain can have the aux RS485 bus terminated by switching S3/6 to ‘ON’ on
the controller PCB. It should be noted that termination should only necessary for extremely
long cable lengths and that not all RS485 interfaces (or Serial Device Servers) are capable of
driving terminated busses.
In this mode JP3 is used for Aux RS485 in and out.
5.3.2 Aux Interface as a host RS485 re-transmitter
When used as a re-transmitter for the host RS485 bus, the last module that forms part of the
first bus segment should be set to ‘Re-transmit’ mode (see section 7.1) and the Aux 485
interface from that module should be connected to the host RS485 of the first module that
forms part of the second bus segment.
Pharmagraph (a division of Acquisition Systems Ltd), 3 Lakeside Business Park, Sandhurst, Berkshire, UK
Tel.: +44 (0) 1252 861700 Fax: +44 (0) 1252 861155 e-mail: [email protected]
Installation and Operating Manual
ASL, Pharmagraph Division, PT2600 PRT Input Module
5.4
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4 Wire PRT Connection
PT2600 Module
PT100
Sensor
I
Pin 1
H
Pin 2
L
Gnd
ADC
Pin 3
Pin 4
The jumpers should not be fitted for 4 wire mode. (This is the factory default setting). The
second current source is not used in this mode.
5.5
3 Wire PRT Connection
PT2600 Module
IA
PT100
Sensor
I
Pin 1
H
Pin 2
L
ADC
Pin 3
IB
Gnd
Pin 4
Both jumpers should be fitted for 3 wire mode. IA flows in the H lead and IB flows in the L lead.
If IA and IB are equal and the lead resistances are equal, the voltage drops down the leads will
cancel each other out.
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Installation and Operating Manual
ASL, Pharmagraph Division, PT2600 PRT Input Module
5.6
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2 Wire PRT Connection
PT2600 Module
I
Pin 2
H
PT100
Sensor
ADC
L
Gnd
6
Pin 1
Pin 3
Pin 4
RESISTANCE MEASUREMENT
The resistance of the PRT is measured by passing a 1mA current through the PRT and
measuring the voltage developed. Internally the current is also passed through a precision,
low drift resistor and the resistance reported is corrected by this measurement. Any drift in
the values of the current source or the voltage measurement are therefore compensated for.
The resistance is converted to a temperature. A sensor error value is reported if the
temperature is outside the range -200 to 850°C.
Pharmagraph (a division of Acquisition Systems Ltd), 3 Lakeside Business Park, Sandhurst, Berkshire, UK
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Installation and Operating Manual
ASL, Pharmagraph Division, PT2600 PRT Input Module
7
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MODE SELECTION
7.1 Re-transmit Mode Selection
To enable or disable ‘Re-transmit’ mode or to enable ‘Self-test’ mode, some special
addresses are used once at power-up only:
Address at
power-up
0 thru 31
Meaning
Normal operation
97
Disable ‘Re-transmit’ mode
98
Enable ‘Re-transmit’ mode
For example, to enable ‘Re-transmit’ mode you must first set the switches to 98 then power
the module off then on again. You must then set the address switches to the desired
address, then power the module off and on again before beginning normal operation.
The Re-transmit mode is non-volatile and will be retained through power cycles since it is
stored in flash memory internal to the module.
7.2 Self-Test Mode Selection
Self test is normally reserved for factory use and is enabled by selecting address 99.
Address at
power-up
0 thru 31
99
Meaning
Normal operation
Self-test mode:
Setting the address to 99 will make the PT2600 cycle through a self-test routine designed to
allow the module to be functionally tested. Self-test cycle comprises:
•
•
Outputting in ASCII readable format to both the Host and Aux RS485 ports:
o
Module address.
o
Firmware version.
o
Switch settings.
o
Resistance values.
o
Temperature values.
LEDs D2 thru D7 are each lit in turn for half a second. During this period, any
characters received will be echoed at the end of this period.
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Installation and Operating Manual
ASL, Pharmagraph Division, PT2600 PRT Input Module
8
ORIENTATION OF HEADER CONNECTORS
To improve ease of installation, two part headers are used for all external connections to the
module.
It is however, vital that the correct orientation of the two part connectors is observed. Pin 1
of the header on the PCB is always at the left when looking into the header with the PCB
viewed from the edge. Failure to observe the correct orientation may result in damage to the
module or failure to operate
correctly
Pin 1
Pin 1
Orientation of pin 1 on two-part headers
.
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Installation and Operating Manual
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USING SERIES 2000 INTERCONNECT MODULES
Where multiple Series 2000 modules are adjacent, the Series 2000 Interconnect Modules
help provide a simple and convenient method of delivering 24V power via a self-resetting (1
Amp) fuse and the host RS485 bus to each module. The Series 2000 Interconnect also
provides a mechanism for attaching a RS485 bus bias module. This is often used to improve
the reliability of RS485 by defining the signals levels on the RS485 bus when no device is
driving it. The address switches and diagnostic LEDs remain accessible through an aperture
in the Interconnect Module.
Each Series 2000 Module ships with an ‘Interconnect Module’ and a ‘Jumper module’ that
may be used to connect to the previous Series 2000 module as shown below:
Interconnect
module fitted
to Series
2000 module
First Series 2000
Module
RS485 bus
bias module
Apply 24Vdc
to this
connector
Apply host
RS485 to this
connector
Jumper module acts
a power and comms
bus between Series
2000 modules
Second Series 2000
Module added with
its own Interconnect
module
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Installation and Operating Manual
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Pharmagraph (a division of Acquisition Systems Ltd), 3 Lakeside Business Park, Sandhurst, Berkshire, UK
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Installation and Operating Manual
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Pharmagraph (a division of Acquisition Systems Ltd), 3 Lakeside Business Park, Sandhurst, Berkshire, UK
Tel.: +44 (0) 1252 861700 Fax: +44 (0) 1252 861155 e-mail: [email protected]
Installation and Operating Manual
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Pharmagraph (a division of Acquisition Systems Ltd), 3 Lakeside Business Park, Sandhurst, Berkshire, UK
Tel.: +44 (0) 1252 861700 Fax: +44 (0) 1252 861155 e-mail: [email protected]